【摘 要】
：
The Yongding New River is essential for the water supplies of Tianjin.To date,there is no comprehensive report that assesses the year-round water quality of the
【机 构】
：
School of Earth System Science,Institute of Surface-Earth System Science,Tianjin University,Tianjin
论文部分内容阅读
The Yongding New River is essential for the water supplies of Tianjin.To date,there is no comprehensive report that assesses the year-round water quality of the Yongding New River Main stream.Moreover,little attention has been given to determining a combined weight for improving the traditional comprehensive water quality identification index(ICWQII)by the game theory.Seven water quality parameters were investigated monthly along the main stream of the Yongding New River from May 2018 to April 2019.Organic contaminants and nitrogen pollution were mainly caused by point sources pollution,and the total phosphorus mainly by non-point source pollution.Dramatic spatio-temporal variations of water quality parameters were jointly caused by different pollutant sources and hydrometeorological fac-tors.In terms of this study,an improved comprehensive water quality identification index(ICWQII)based on entropy weight or variation coefficient and traditional CWQII underes-timated the water qualities,and an ICWQII based on the superstandard multiple method overvalued the assessments.By contrast,water qualities assessments done with an ICWQII based on the game theory matched perfectly with the practical situation.The ICWQII based on game theory proposed in this study takes into account not only the degree of disorder and variation of water quality data,but also the influence of standard-exceeded pollution indicators,whose results are relatively reasonable.All findings and the ICWQII based on game theory can provide scientific support for decisions related to the water environment management of the Yongding New River and other waters.
其他文献
Background:Micronaire is a comprehensive index reflecting the fineness and maturity of cotton fiber.Micronaire is one of the important internal quality indicato
Constructed wetlands(CWs)have been introduced to and developed in China for environ-mental engineering over the most prosperous three decades(1990-2020).To stud
为了提高超大型集装箱船舱盖的设计水平,以20000 TEU集装箱船为研究对象,对舱盖设计、制造和安装过程遇到的难点和关键点进行了全面分析。从初期研讨重点、变形控制检查入手,重点讨论了导向形式选择和布置及支撑块、止跳装置等其他关键点。该项目6艘船2年来的运营表明:舱盖完全满足设计要求。该设计对同类大型集装箱船的舱盖设计具有普遍的指导意义。
Lead halide perovskites MAPbX3(MA = CH3NH3 or Cs;X = I,Br,Cl)are well considered to be potential candidates for photocatalytic reaction due to its excellent pho
针对全球航运业的碳排放问题,以17万立方米级LNG船为研究对象,研究了不同推进方式对船舶能效设计指数(EEDI)的影响,具体指出了双燃料低速机直推型LNG船EEDI的计算方法。结果表明:相比二冲程柴油机及双燃料电力推进LNG船,双燃料低速机直推传动效率更高,EEDI更优;并且研究了不同节能装置对该型船EEDI的贡献效果,发现在不改变主机最大输出功率(SMCR)的前提下,充分利用螺旋桨转速裕度配置轴带发电机可有效提升EEDI。
Cadmium(Cd)contamination in paddy soil has caused public concern.The uptake of Cd by rice plants depends on soil Cd mobility,which is in turn substantially infl
Since the beginning of the 21 st century,the increasing production and application of nano-TiO2in consumer products have inevitably led to its release into aquatic systems and therefore caused the exposure of aquatic organisms,resulting in grow
Volatile organic compounds(VOCs),important precursors of ozone(O3)and fine particulate matter(PM2.5),are the key to curb the momentum of O3 growth and further r
Cadmium contamination of soil is a global issue and in-situ remediation technology as a promising mitigation strategy has attracted more and more attention.Many nanomaterials have been applied for the in-situ remediation of cadmium-contaminated soil due t
High values of ozone(O3)occur frequently in the dry spring season;thus,understanding The evolution characteristics of volatile organic compounds(VOCs)in spring